Experimental Study on Freezing Engineering Temperature Field of the Connecting Channel in Soft Soil Layer
Based on the freezing project of a connecting channel of Nanjing Metro Line 7,the change law of soil tempera-ture in the reinforcement area is studied when the artificial freezing method is used to strengthen the soft soil of water-rich sand layer,to provide data and technical support for similar freezing projects.By arranging temperature measuring holes in the freezing and strengthening soil layer,the freezing temperature field of the soil layer in the freezing and strengthening area is measured,and the temperature change law is obtained.The results show that the tem-perature change of brine in main pipes for brine supply and return can be divided into three stages:rapidly decreasing,maintaining stability and maintaining freezing;the soil cooling at each measuring point shows a trend of first fast and then slow;the closer to the freezing pipe,the greater the number of freezing pipes nearby,the faster the freezing wall expands,the expansion rate to the inside is greater than that to the outside;the minimum freezing wall thickness and the average temperature of the freezing wall both meet the design requirements when frozen for 45 days.The artificial freezing method is used to reinforce the connecting channel of Nanjing Metro Line 7,the thickness and average tempera-ture of the freezing wall meet the design requirements within the design days,and the reinforcement effect is good.There-fore,the artificial freezing method can achieve a good reinforcement effect in weak strata,and provide data and techni-cal support for similar freezing projects.
connecting channelfreezing methodtemperature field variationsoft soil layer
万方数据
维普
